Featuring accurate core technology (act), a coated hexagonal core wire that locks the nickel-plated steel wrap wire in place to increase stability and maintains intonation at any tension Dots go right into tune and deliv??????er clean and clear notes Change tunings and be surprised how dot's lock right in without constant adjustment Dot - drop down tuning electric Guitar strings: drop down extra heavy 12-60 12, 16, 20, 38, 52, 60